Returns a sub-string from the left part of a text string.
Syntax:
LEFT( text {, length:Number} )
Returns the leftmost length characters of the text string.
If the length parameter is omitted, 1 (one) is assumed.
Example:
LEFT("Thunderbird", 7)
returns the text string "Thunder"
.
Revisions:
Starting with 2.00, a length of zero is allowed for consistency with the MID()
function.